327 lines
6.6 KiB
C
327 lines
6.6 KiB
C
/*
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* Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <fs.h>
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#include <linux/stat.h>
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#include <errno.h>
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#include <malloc.h>
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#include <getopt.h>
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#include <xfuncs.h>
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#include <init.h>
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#include <ioctl.h>
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#include <nand.h>
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#include <linux/mtd/mtd-abi.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <linux/list.h>
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struct nand_bb {
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char cdevname[MAX_DRIVER_NAME];
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struct cdev *cdev_parent;
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char *name;
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int open;
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int needs_write;
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struct mtd_info_user info;
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loff_t raw_size;
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loff_t size;
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loff_t offset;
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unsigned long flags;
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void *writebuf;
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struct cdev cdev;
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struct list_head list;
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};
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static ssize_t nand_bb_read(struct cdev *cdev, void *buf, size_t count,
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loff_t offset, ulong flags)
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{
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struct nand_bb *bb = cdev->priv;
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struct cdev *parent = bb->cdev_parent;
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int ret, bytes = 0, now;
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debug("%s %d %d\n", __func__, offset, count);
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while(count) {
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ret = cdev_ioctl(parent, MEMGETBADBLOCK, &bb->offset);
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if (ret < 0)
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return ret;
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if (ret) {
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printf("skipping bad block at 0x%08llx\n", bb->offset);
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bb->offset += bb->info.erasesize;
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continue;
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}
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now = min(count, (size_t)(bb->info.erasesize -
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((size_t)bb->offset % bb->info.erasesize)));
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ret = cdev_read(parent, buf, now, bb->offset, 0);
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if (ret < 0)
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return ret;
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buf += now;
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count -= now;
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bb->offset += now;
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bytes += now;
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};
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return bytes;
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}
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/* Must be a multiple of the largest NAND page size */
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#define BB_WRITEBUF_SIZE 4096
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#ifdef CONFIG_MTD_WRITE
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static int nand_bb_write_buf(struct nand_bb *bb, size_t count)
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{
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int ret, now;
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struct cdev *parent = bb->cdev_parent;
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void *buf = bb->writebuf;
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off_t cur_ofs = bb->offset & ~(BB_WRITEBUF_SIZE - 1);
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while (count) {
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ret = cdev_ioctl(parent, MEMGETBADBLOCK, &cur_ofs);
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if (ret < 0)
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return ret;
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if (ret) {
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debug("skipping bad block at 0x%08x\n", cur_ofs);
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bb->offset += bb->info.erasesize;
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cur_ofs += bb->info.erasesize;
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continue;
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}
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now = min(count, (size_t)(bb->info.erasesize));
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ret = cdev_write(parent, buf, now, cur_ofs, 0);
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if (ret < 0)
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return ret;
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buf += now;
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count -= now;
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cur_ofs += now;
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};
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return 0;
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}
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static ssize_t nand_bb_write(struct cdev *cdev, const void *buf, size_t count,
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loff_t offset, ulong flags)
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{
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struct nand_bb *bb = cdev->priv;
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int bytes = count, now, wroffs, ret;
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debug("%s offset: 0x%08llx count: 0x%08x\n", __func__, offset, count);
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while (count) {
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wroffs = bb->offset % BB_WRITEBUF_SIZE;
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now = min((int)count, BB_WRITEBUF_SIZE - wroffs);
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memcpy(bb->writebuf + wroffs, buf, now);
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if (wroffs + now == BB_WRITEBUF_SIZE) {
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bb->needs_write = 0;
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ret = nand_bb_write_buf(bb, BB_WRITEBUF_SIZE);
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if (ret)
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return ret;
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} else {
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bb->needs_write = 1;
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}
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bb->offset += now;
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count -= now;
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buf += now;
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}
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return bytes;
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}
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static int nand_bb_erase(struct cdev *cdev, size_t count, loff_t offset)
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{
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struct nand_bb *bb = cdev->priv;
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if (offset != 0) {
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printf("can only erase from beginning of device\n");
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return -EINVAL;
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}
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return cdev_erase(bb->cdev_parent, bb->raw_size, 0);
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}
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#endif
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static int nand_bb_open(struct cdev *cdev, unsigned long flags)
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{
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struct nand_bb *bb = cdev->priv;
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if (bb->open)
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return -EBUSY;
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bb->flags = flags;
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bb->open = 1;
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bb->offset = 0;
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bb->needs_write = 0;
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bb->writebuf = xmalloc(BB_WRITEBUF_SIZE);
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return 0;
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}
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static int nand_bb_close(struct cdev *cdev)
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{
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struct nand_bb *bb = cdev->priv;
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#ifdef CONFIG_MTD_WRITE
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if (bb->needs_write)
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nand_bb_write_buf(bb, bb->offset % BB_WRITEBUF_SIZE);
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#endif
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bb->open = 0;
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free(bb->writebuf);
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return 0;
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}
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static int nand_bb_calc_size(struct nand_bb *bb)
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{
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loff_t pos = 0;
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int ret;
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while (pos < bb->raw_size) {
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ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, &pos);
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if (ret < 0)
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return ret;
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if (!ret)
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bb->cdev.size += bb->info.erasesize;
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pos += bb->info.erasesize;
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}
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return 0;
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}
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static loff_t nand_bb_lseek(struct cdev *cdev, loff_t __offset)
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{
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struct nand_bb *bb = cdev->priv;
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unsigned long raw_pos = 0;
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uint32_t offset = __offset;
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int ret;
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/* lseek only in readonly mode */
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if (bb->flags & O_ACCMODE)
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return -ENOSYS;
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while (raw_pos < bb->raw_size) {
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off_t now = min(offset, bb->info.erasesize);
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ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, (void *)raw_pos);
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if (ret < 0)
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return ret;
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if (!ret) {
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offset -= now;
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raw_pos += now;
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} else {
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raw_pos += bb->info.erasesize;
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}
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if (!offset) {
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bb->offset = raw_pos;
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return __offset;
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}
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}
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return -EINVAL;
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}
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static struct file_operations nand_bb_ops = {
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.open = nand_bb_open,
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.close = nand_bb_close,
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.read = nand_bb_read,
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.lseek = nand_bb_lseek,
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#ifdef CONFIG_MTD_WRITE
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.write = nand_bb_write,
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.erase = nand_bb_erase,
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#endif
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};
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static LIST_HEAD(bb_list);
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/**
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* Add a bad block aware device ontop of another (NAND) device
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* @param[in] dev The device to add a partition on
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* @param[in] name Partition name (can be obtained with devinfo command)
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* @return The device representing the new partition.
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*/
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int dev_add_bb_dev(char *path, const char *name)
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{
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struct nand_bb *bb;
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int ret = -ENOMEM;
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bb = xzalloc(sizeof(*bb));
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bb->cdev_parent = cdev_open(path, O_RDWR);
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if (!bb->cdev_parent)
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goto out1;
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if (name) {
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strcpy(bb->cdevname, name);
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} else {
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strcpy(bb->cdevname, path);
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strcat(bb->cdevname, ".bb");
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}
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bb->cdev.name = bb->cdevname;
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bb->raw_size = bb->cdev_parent->size;
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ret = cdev_ioctl(bb->cdev_parent, MEMGETINFO, &bb->info);
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if (ret)
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goto out4;
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nand_bb_calc_size(bb);
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bb->cdev.ops = &nand_bb_ops;
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bb->cdev.priv = bb;
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ret = devfs_create(&bb->cdev);
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if (ret)
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goto out4;
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list_add_tail(&bb->list, &bb_list);
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return 0;
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out4:
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cdev_close(bb->cdev_parent);
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out1:
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free(bb);
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return ret;
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}
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int dev_remove_bb_dev(const char *name)
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{
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struct nand_bb *bb;
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list_for_each_entry(bb, &bb_list, list) {
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if (!strcmp(bb->cdev.name, name)) {
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devfs_remove(&bb->cdev);
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cdev_close(bb->cdev_parent);
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free(bb);
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return 0;
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}
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}
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return -ENODEV;
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}
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